Seema Saini Solutions for Chapter: Some Basic Concepts, Mole Concept and Stoichiometry, Exercise 3: DPP 1.3

The vapour density of a gas $\mathrm{A}$ is twice the vapour density of a gas $\mathrm{B}$. If the molecular weight of $\mathrm{B}$ is $\mathrm{M}$, what will be the molecular weight of $\mathrm{A}$?

The atomic weight of two elements $\mathrm{A}$ and $\mathrm{B}$ are $40$ and $80$ respectively. If $\mathrm{x} \mathrm{g}$ of $\mathrm{A}$ contains $\mathrm{y}$ atoms, how many atoms are present in $2\mathrm{x} \mathrm{g}$ of $\mathrm{B}$? 

Which of the following statements are correct about $1.7 \mathrm{g}$ of ${\mathrm{NH}}_3$?

Which of the following has the same percentage of carbon as in ethene?

$2.0 \mathrm{g}$ of a tri-atomic gaseous element was found to occupy a volume of $448 \mathrm{mL}$ at $76 \mathrm{cm}$ of $\mathrm{Hg}$ and $273 \mathrm{K}$. Then, what is the mass of its atom?

You have given $4.25 \mathrm{g} {\mathrm{NH}}_3 \left(\mathrm{g}\right)$.

Given: Atomic weight of $\mathrm{N}-14; \mathrm{H}-1$ 

Find out which of the following statements are correct regarding above ${\mathrm{NH}}_3$? 

Which of the following contains same number of molecules?

For $3 \mathrm{mole}$ of ammonia gas, which of the following is true?